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java 添加mongodb 报错不知道为啥？

in Technique[技术] by (71.8m points)

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正常情况这不应该报错啊
mongodb maven配置如下
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by (71.8m points)

抽象类不能被实例化，报错信息中描述的已经很详细了，建议楼主复习下多态，接口，以及抽象类


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